# Particle Asymmetries from Quantum Statistics

## TL;DR

This paper explores a novel baryogenesis mechanism where quantum statistical effects in a CP-invariant Lagrangian, combined with matter asymmetries, produce baryon asymmetry through decay channel enhancements.

## Contribution

It introduces a new class of baryogenesis models where quantum statistics and matter asymmetries generate baryon asymmetry without explicit CP violation in the Lagrangian.

## Key findings

- Quantum statistics can induce baryon asymmetry in CP-invariant models.
- Matter effects like dark matter asymmetry break CP symmetry effectively.
- Decay processes exhibit Bose enhancement and Pauli blocking that lead to asymmetry.

## Abstract

We consider a class of baryogenesis models where the Lagrangian in the visible sector is Charge-Parity (CP) invariant and a baryon asymmetry is produced only when quantum statistics is taken into account. The CP symmetry is broken by matter effects, namely the assumption that the primordial plasma contains another asymmetric species, such as dark matter. Out-of-equilibrium baryon number violating decays can then generate an asymmetry through Bose enhancement and/or Pauli blocking of certain decay channels.